TestRunner support in test's build.gradle

* Fixes to tests
 * RunKonanTest runs tests build with TestRunner
 * Standalone tests

backend.native/tests/codegen/enum/linkTest_lib.kt

@@ -1,4 +1,4 @@
-package codegen.enum.linkTest.a
+package a
 
 enum class A(val x: Int) {
     Z1(42),

backend.native/tests/codegen/enum/linkTest_main.kt

@@ -1,10 +1,6 @@
-package codegen.enum.linkTest_main
+import a.*
 
-import kotlin.test.*
-
-import codegen.enum.linkTest.a.*
-
-@Test fun runTest() {
+fun main(args: Array<String>) {
     println(A.Z1.x)
     println(A.valueOf("Z2").x)
     println(A.values()[2].x)